The enhanced gas-sensing and photocatalytic performance of hollow and hollow core-shell SnO₂-based nanofibers induced by the Kirkendall effect

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• 作者：Huimin Zhou^a ; Zhiyong Li^a ; Xiao Niu^a ; Xin Xia^a ; ^{xjxiaxin@163.com" class="auth_mail" title="E-mail the corresponding author} ; Qufu Wei^b ; ^{qfwei@jiangnan.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Structured SnO2-based nanofibers ; Modified Kirkendall Effect ; Gas sensor ; Photocatalyst
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1817-1826
• 全文大小：7193 K

文摘

In order to enhance the properties of SnO₂-based nanomaterials, hollow SnO₂ nanofibers and core–shell TiO₂–SnO₂ nanofibers were prepared by using a facile single-needle electrospinning. The Kirkendall Effect during the calcination stage plays a decisive role for the molding of hollow structure, as well as hollow core–shell conformation, which is rarely reported in the complicated two-step protocol. The hollow and hollow core–shell SnO₂ nano-objects exhibit excellent properties in gas sensor and photocatalysis, respectively. The hollow SnO₂ nanofibers achieve high selectivity toward ethanol (below 100 ppm) and ethyl acetate (above 100 ppm), mainly because of the tubular cavity, porous structure and the targeted gas property. The TiO₂ doped hollow core–shell SnO₂ nanofibers failed to improve the gas-sensing performances, but it acquired a high degradation of 79% for methylene blue within 10 mins, compared with that of 60% for the hollow SnO₂ nanofibers.